<!DOCTYPE html>
<html lang=&quot;en">

<head>
    <meta charset="UTF-8">
    <title>mydemo</title>
    <style type="text/css">
        body,
        pre {
            margin: 0;
            padding: 0;
        }

        #outer {
            margin: 10px;
            border: 1px dashed black;
            background: white;
            padding: 10px;
        }
    </style>
    <script type="text/javascript">
        window.onload = function () {
            /*转义字符的运用*/
            alert("typeof 12345 → " + '\u2192' + typeof 12345 + "\n\ntypeof \"abc\" → " + typeof "abc" + "\n\ntypeof document → " + typeof document
            );
        }
    </script>
</head>

<body>
    <pre id="outer">
&lt;script&nbsp;type=&quot;text/javascript&quot;&gt;
	alert(typeof 12345);		//输出number
	alert(typeof &quot;abc&quot;);		//输出string
	alert(typeof document);		//输出object
&lt;/script&gt;
</pre>
</body>

</html>